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How To Make Abrasive Sanding Belts
Jul 27, 2017

Production of the sanding belts generally includes the original cloth processing, large volume manufacturing, large volume of post-processing and conversion of four processes.

First, the original cloth processing

Sand Belt used in the matrix of cloth, paper and composite base. Paper in addition to water-resistant paper is generally not need to deal with the composite base is a combination of paper and cloth, and sometimes in the sub-supply directly to the procurement, or in the sand belt production plant Of the original cloth processing line or large roll manufacturing line to complete here to explain the cloth processing shaving, singeing, dewaxing, dyeing, dipping scraping, stretching, calendering and other major processes, according to different requirements selected Different processes.

1, shaving, singeing

Shaving, singeing is to remove the original cloth surface of the lint, neps, impurities and other defects, through a spiral scraper, the fabric surface scraping net, and then burned through the high temperature flame plaster surface plush, Smooth and smooth.

2, desizing degreasing

Degreasing degreasing is to remove the cotton yarn on the dry pulp and cotton fiber in the wax quality, it is through the lye soak to remove, desizing and degreasing cotton, easy to pulp absorption and penetration.

3, dyeing impregnation and scraping

As the abrasive belts on the substrate color requirements are relatively low, so dyeing, impregnation and scraper together, that is, the dyed dye directly impregnated and added to the slurry, in order to achieve the purpose of dyeing. The treatment of water-resistant products must be impregnated with resin material, and the general non-water resistant products are impregnated with animal glue.

4, stretch

Stretching includes longitudinal and transverse stretching, longitudinally drawing away a part of the elongation and reducing the extension of the finished product. The transverse stretching has a shape and a tenter effect to ensure that the width of the cloth after treatment is within a certain range.

5, calendering

Calendering is the final process of the original cloth, the purpose is to make the cloth both smooth and smooth, uniformity of the glue played a guarantee role.

Second, large volume manufacturing

Large volume manufacturing, including trademark printing, coating, sand, compound, dry and other major processes, these processes are completed in a production line, it is a linkage operation of the production line.

1, the trademark printing: This process is completed in the abrasive cloth or paper-based printing factory logo, abrasive particle size, model and the relevant provisions of the factory, printing must be clear, clear, beautiful and easy to identify users of the product data, When the direction of the use of the belt and so on.

2, coating: including primer and overcoating, such as the amount of coating (primer and re-glue) sand production in the modern production line are used to automatically scan and its information back to the automatic adjustment control device. Many large enterprises have adopted β-ray penetration measurement, but its stability, safety and accuracy is poor, the recent number of well-known sandpaper belt abrasive cloth enterprises have made a large technological transformation, the successful use of the Γ-ray line measurement, the measurement accuracy of 0.25mm measurement error of ± 0.25%, measurement accuracy and stability, safety than the previous measurement system is superior, coupled with touch-type monitoring display and automatic feedback control, coupled with dry Online temperature automatic control, the formation of a complete sandpaper belt abrasive volume measurement quality control system, you can ensure the stability of each batch of product quality.

The thickness of the primer and the composite in production is controlled by the gap control between the two rollers.

3, sand: sanding there are two ways, one is the gravity of sand, the other is electrostatic sand plantation. Gravity sand is by abrasive gravity sand coat above, so the arrangement of abrasive on the glue layer is more messy, there is no certain direction. Electrostatic sand is the leading electrostatic field power to absorb the abrasive after the attraction to the adhesive layer, so the orderly arrangement of abrasive, and abrasive edges and edges outward, it is very favorable, because the direction of the abrasive must be bound with the base of a certain , The substrate surface abrasive orientation to form a zigzag-like structure, so the abrasive surface in the belt can be the best of this best effect, grinding capacity is bound to increase. As the static sand on the coarse grain size (40 # to coarse) does not apply, so this part of the abrasive to use gravity to complete the sand.

4, dry: large rolls in the sand must be dry. Drying equipment is fully enclosed and dry and has the characteristics of dry and dry drying function. Fully enclosed dry should be dry high temperature, long time, in order to reduce the heat and heat cycle to fully use to improve the efficiency of heat, harmful waste to reduce the concentration of the environment Pollution in the form of a closed and dry is conducive to the production of sand belt, and generally have more than 1000 meters capacity, is conducive to dry and dry resin resin dry and long time characteristics. Drying equipment with humidity control function is to make the abrasive belt in the high temperature and long baking the physical moisture loss caused by the bricks of the bricks of the shortcomings, where the emery cloth out of the area to increase the humidifier, so that the water content of the emery cloth and normal Balance, so the abrasive cloth in the drying process should have this function of the device.

Third, the large volume of post-processing

Emery cloth from the drying room after the roll, to go through a series of treatment before entering the conversion process. After the large volume of self-care, including post-curing, storage, moisturizing, soft and so on. Through these processing steps, the performance and quality of the emery cloth (paper) can achieve the intended goal.

1, after curing. The large roll of paper from the drying chamber (paper), due to the lower temperature in the drying chamber, the time is shorter, but the completion of the pre-curing stage of the abrasive reached the positioning, but the phenolic resin curing reaction, B stage, such as completely true curing, also need a higher temperature and time to become insoluble non-melting C-stage resin, its quality can get the desired effect.

2, storage. After a few hours of high temperature curing, the phenolic resin binder in the occurrence of curing reaction, due to the formation of polymer chain chain asymmetry, resulting in internal stress imbalance, the formation of the so-called "internal reaction" caused by abrasive The surface deformation is uneven or distorted. This defect, after a certain period of time after storage, this should be slowly to self-disappear, the surface of the cloth with a smooth row of very clean, large volume of the best storage in the constant temperature and humidity of the warehouse, the storage effect will be better.

3, humidification. Whether it is Shabu roll or sandpaper roll, in the normal must contain a certain amount of physical water, when the water loss to a certain extent, the emery or sandpaper will be brittle. Large crushed cloth in the curing furnace time high temperature baking, the loss of water is also more serious, resulting in a certain brittle, so by humidification to restore the moisture contained in the emery cloth to improve the flexibility and toughness of the emery cloth.

4, soft. Belt also known as flexible abrasive. In order to achieve flexibility, one is the choice of matrix materials and adhesives are flexible materials, made of the product itself is very soft, this product does not need to flex, it is more difficult things, the second is soft song. In order to deal with difficult grinding materials, large grinding processing and heavy-duty grinding must be used in the thickness and weight of the larger matrix, the bond strength, high heat resistance of the thermosetting resin, so that its flexibility will improve, but overall The upper belt is soft and still hard from the microscopic, which is the task of mechanical softening to complete. The role of mechanical soft song, simply put, is to make the surface of the belt slightly small cracks, so as to obtain the entire belt of soft.

Four, conversion

The so-called conversion refers to the process of converting the emery cloth into a belt or disc, sheet and other shaped products.

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